The influence of high grain boundary density on helium retention in tungsten

被引：45

作者：

Valles, G. ^{[1
]}

Gonzalez, C. ^{[2
]}

Martin-Bragado, I. ^{[3
]}

Iglesias, R. ^{[2
]}

Perlado, J. M. ^{[1
]}

Rivera, A. ^{[1
]}

机构：

[1] UPM, Inst Fus Nucl, Madrid 28006, Spain

[2] Univ Oviedo, Dept Fis, E-33007 Oviedo, Spain

[3] IMDEA Mat Inst, Madrid 28906, Spain

来源：

JOURNAL OF NUCLEAR MATERIALS | 2015年 / 457卷

关键词：

HE-3 IMPLANTED TUNGSTEN; AUGMENTED-WAVE METHOD; MOLECULAR-DYNAMICS; IRRADIATED TUNGSTEN; LOW-ENERGY; 1ST-WALL; EVOLUTION; METALS; BUBBLE; SIMULATION;

D O I：

10.1016/j.jnucmat.2014.10.038

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to study the influence of a high grain boundary density on the amount, size and distribution of defects produced by pulsed helium (625 keV) irradiation in tungsten, we have carried out Object Kinetic Monte Carlo (OKMC) simulations in both monocrystalline and nanocrystalline tungsten. The parameterization of the OKMC code (MMonCa) includes binding energies obtained with our in-house Density Functional Theory (DFT) calculations. In the interior of a grain in nanocrystalline tungsten the mixed HenVm clusters are larger and have a lower He/V ratio. Thus, they are less pressurized clusters. The total elastic strain energy remains almost constant with the increasing number of pulses, contrary to its increase in monocrystalline tungsten. A better response to helium irradiation is therefore expected in nanocrystalline tungsten, opening a new path to investigate these nanostructured materials for fusion purposes. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：80 / 87

页数：8

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